srl: With regards to Open Source
version of MS's Webtool (see my last diary entry), there is
the Apache project's
JMeter
which
look rather good (it is in Java though, which may be a
negative for some people). I'll try it out sometime and
report.

There is at least one other Open Source Java webserver load
benchmarking tool (OSJWLBT ?!?!) available. I can't
remember what it is called, but I tried it, and couldn't
figure out how to use it, and then I switched to MS
Webtool.